广西植物2023，Vol.43Issue(12)：2300-2308,9.DOI:10.11931/guihaia.gxzw202210069
氧化铈纳米颗粒种子引发对盐胁迫下辣椒种子萌发及幼苗生长的影响
Effects of cerium oxide nanoparticles seed priming on seed germination and seedling growth of pepper under salt stress
摘要
Abstract
Cerium oxide nanoparticles(CeO2 NPS)have been shown to improve the salt tolerance of plant due to the potential to eliminate free radicals and the antioxidation properties.However,the effects and mechanisms of seed priming with CeO2NPS on pepper plant are unclear.To reveal impacts of CeO2 NPS seed priming on the germination and seedling growth of peeper plants under salt stress,using the Maoshu 360 variety of pepper(Capsicum annuum)as material,a total of seven concentrations of treatments(0,0.05,0.1,0.2,0.3,0.4,0.5 mmol·L-1)and a control of un-treatment were carried out to investigate effects of CeO2 NPS seed priming on seed germination rate,seedling biomass,and physiological and biochemical indexes under salt stress.The results were as follows:(1)In the seed priming with 0.5 mmol·L-1 CeO2NPS,soluble protein,content of proline,activity of catalase(CAT),content of ascorbic acid(AsA)and ratio of AsA/DHA significantly increased and levels of the superoxide anion(O2-)significantly decreased.There was no loss of viability for the seeds primed with cerium oxide nanoparticles.Indeed their germination rate and germination potential were enhanced under salt stress,and their germination index,and vigor index were improved under salt stress.(2)Under salt stress,seedlings from seeds primed with 0.4 mmol·L-1 CeO2 NPS showed the highest fresh weight,dry weight,and root length;additionally,soluble protein content,AsA content and AsA/DHA ratio were also improved.In conclusion,seed priming with CeO2NPS can not only enhance seed germination under salt stress by decreasing seed water potential,accelerating storage substances metabolism and improving antioxidant capacity but also promote seedling growth through boosting protein synthesis and ascorbic acid-glutathione cycle(AsA-GSH).关键词
纳米氧化铈/辣椒/种子引发/盐胁迫/幼苗生长Key words
cerium oxide nanoparticles(CeO2NPS)/pepper/seed priming/salt stress/seedling growth分类
生物学引用本文复制引用
秦中维,林欣琪,魏茜雅,梁腊梅,李映志..氧化铈纳米颗粒种子引发对盐胁迫下辣椒种子萌发及幼苗生长的影响[J].广西植物,2023,43(12):2300-2308,9.基金项目
广东省科技厅科技计划项目(2016A020210116,2012A020602051) （2016A020210116,2012A020602051）
广东海洋大学创新强校工程科研项目(GDOU2016050256,GDOU2013050217). （GDOU2016050256,GDOU2013050217）
